Improve remove in StyleManager properties

src/style_manager/model/Sectors.js

@@ -2,5 +2,14 @@ import Backbone from 'backbone';
 import Sector from './Sector';
 
 export default Backbone.Collection.extend({
-  model: Sector
+  model: Sector,
+
+  initialize() {
+    this.listenTo(this, 'reset', this.onReset);
+  },
+
+  onReset(models, opts = {}) {
+    const prev = opts.previousModels || [];
+    prev.forEach(sect => sect.get('properties').reset());
+  }
 });

src/style_manager/view/PropertyColorView.js

@@ -7,6 +7,11 @@ export default PropertyIntegerView.extend({
     this.inputInst.setValue(value, opts);
   },
 
+  remove() {
+    PropertyIntegerView.prototype.remove.apply(this, arguments);
+    ['inputInst', '$color'].forEach(i => (this[i] = {}));
+  },
+
   onRender() {
     if (!this.input) {
       const ppfx = this.ppfx;

src/style_manager/view/PropertyCompositeView.js

@@ -27,6 +27,12 @@ export default PropertyView.extend({
     PropertyView.prototype.clear.apply(this, arguments);
   },
 
+  remove() {
+    this.model.get('properties').reset();
+    PropertyView.prototype.remove.apply(this, arguments);
+    ['properties', 'props', '$props'].forEach(i => (this[i] = {}));
+  },
+
   /**
    * Renders input
    * */

src/style_manager/view/PropertyView.js

@@ -95,6 +95,9 @@ export default Backbone.View.extend({
 
   remove() {
     Backbone.View.prototype.remove.apply(this, arguments);
+    ['em', 'target', 'input', '$input', 'propTarget', 'sector'].forEach(
+      i => (this[i] = {})
+    );
     this.__destroyFn(this._getClbOpts());
   },